[amp_mcq option1=”from reservoir A to reservoirs B and C” option2=”from reservoir B to reservoirs C and A” option3=”from reservoir C to reservoirs A and B” option4=”unpredictable” correct=”option1″]
The correct answer is A. from reservoir A to reservoirs B and C.
The hydraulic grade line is a line that represents the total energy of the water in a pipe. It is always above the elevation of the water in the reservoir, because the water in the pipe has additional energy due to its motion. If the hydraulic grade line is above the elevation of reservoirs B and C, then the water in the pipe will flow from reservoir A to reservoirs B and C.
Option B is incorrect because the water in the pipe cannot flow from reservoirs B and C to reservoir A, because the hydraulic grade line is above the elevation of reservoirs B and C.
Option C is incorrect because the water in the pipe cannot flow from reservoir C to reservoirs A and B, because the hydraulic grade line is above the elevation of reservoir C.
Option D is incorrect because the direction of flow is predictable, as explained above.